Perhaps you should try some spelling variations:
recherches dans » recherche dans, recherche des, recherche mais
recherche bank » recherche dans, recherche en, recherche a
economic rents » economic trends, economic reforms
economic risks » economic crisis, economic crises
studi e » studi per, studia ve, studie 2

You may be able to get more results by adjusting your search query.

• If you are trying to use Boolean operators, they must be ALL CAPS: studi e ((recherche bank) OR (recherches dans)) ((economic rents) OR (economic risks)) ;~.
• The words AND, OR and NOT may confuse the search; try adding quotes: "studi e ((recherche bank) OR (recherches dans)) ((economic rents) or (economic risks)) ;~".
• Adding a wildcard symbol may retrieve word variants: studi e ((recherche bank) OR (recherches dans)) ((economic rents) or (economic risks)) ;*.